It's a delicate subject, I've mentioned my opinions before. But I completely agree that the decision is made by the people involved and if they are happy, what more can you ask for.
In some of the circumstances the relationship would be very much needs driven, but that can work out well. Beautiful Young Lady and a relatively wealthy older man would work fine, and the older he is the sooner he dies lol (only joking!)
I don't believe that you can have a successfull marriage based solely on love, but also I don't think you can have one based purely on needs and practicalities. A mix of both will work.
Still wonder whether you can combine conversations about Bus Passes with going clubbing... But then bedtime will always be fun... I believe the artificial hips are quite good now!
Enjoy life people, you only live once.